Love at Twenty unites five directors from five different countries to present their different perspectives on what love really is at the age of 20. The episodes are united with the score of Georges Delerue and still photos of Henri Cartier-Bresson.
Free-lance undercover agent Coplan receives a phone call from an old girlfriend in Turkey. The panic-stricken woman gives sketchy details of a plot that threatens world security. When Coplan arrives, he is told the woman has been killed, and the trail of the murderer leads to her mad-scientist brother.
Serge follows Hélène in the crowded streets of Paris and manages to seduce her. Werther takes Sophie to her dentist, Raoul, who tries to seduce her too.
The German professor tries out his time machine in Turkey. Everybody is after this new invention - Superman Detective Murat, his cheating colleagues Atak and Matrak as well as the mob leader. Agatha, the daughter of the mob leader, steals heroin with her father's man. The mob leader wants to detect their place by the time machine. Murat, Matrak and Atak struggle for the machine, but the machine blows up, the Professor loses his memory. Atak and Matrak kidnap him.
One of Tony and Brad's best with the boys on the hunt for a treasure of missing LSD that has been stolen by a criminal organization. Their quest eventually leads the boys to far-off desert oil ruins where much of the film's best action occurs.
FBI agent Brad joins Tony and Nick, the self styled Supermen who battle crime wearing bullet-proof super-suits. They are on a case involving radioactive counterfeit money and people who can be broken down into precious jewels.
Two boxing promoters travel via time machine back to the days of Hercules, who must save them from Genghis Khan and the Mongol Horde.
The hero steals the haul from the thieves, gives it back to the police but charges 10% for his services.
The Three Supermen attempt to reclaim the stolen lease of a uranium mine.
The Three Fantastic Supermen travel to Tokyo in search of a stolen miniaturization ray which they end up testing upon themselves.
Three couples of young students decide to live together in an apartment the natural way, openly without prejudice.
A scientist invents a filter that can increase the power of a laser beam, turning it into a death ray! A dangerous crime organization wants the device and will stop at nothing to get it, while murder and violence follow Joe and Tom to Singapore as they try to foil the evil plans.
With their time machine, the three Supermen try to recover antique treasures and end up in the West and find the most famous treasure of THE BANDIT. But the treasures vanish when they try to take them into their time.
